Tool for grinding valves and the like.



J. W. FRAIN & G. B. BAILEY. TOOL FOR GRINDING VALVES AND THE LIKE. APPLICATION FILED APR. 3. l9l6.

1 ,21 8,754. Patented Mar. 13, 1917.

F 1 v 2 SHEETSSHEET I- ATTORNEY v APPLICATION FILED APR. 3, I916.

. Patented Mar. 13-, 191?.

2 SHEET'SHEET 2.

Figl4.

WIT/V588.

QBWW 14.02%

UNITED STATES PATENT OFFICE.

JOHN W. FRAIN AND GEORGE B. BAILEY, 0F PITT-SBURG, KANSAS.

TOOL FOR GRINDING VALVES AND THE LIKE.

Specification of Letters Patent. Patented luar, 13, 1917.

Application filed April 3, 1916. Serial No. 88,715.

To all whom it may concern:

B it known that we, JOHN W. FRAIN and GEORGE B. BAILEY, citizens of the United States, residing at Pittsburg, in the county of Crawford and State of Kansas, have invented certain new and useful Improvements in Tools for Grinding Valves and the like, of which the following is a specification.

This invention relates to tools for grinding valves and the like, and our object is to produce an eflicient tool for oscillating a valve upon its seat and imparting a greater range of movement or rotation to the valve in its oscillations in one direction than in the other direction so that the valve shall not oscillate back and forth twice in the same place but shall, on the contrary, change its position with every alternate oscillation and thus grind itself and its seat perfectly smooth and uniformly so that it will properly fit its seat when placed thereon.

A further object is to produce a valve grinding tool of simple, small, compact, durable and inexpensive construction, and which can be equipped with and driven by a small electric motor.

Another object is to provide a motor driven valve grlnder whlch 1s convemently portable and easily handled so as to be adaptable for use in grinding valves and the seats thereof of different types of internal combustion engines.

With the objects named in view, the invention consists in certain novel and peculiar features of construction and combination of parts as hereinafter described and claimed;

and in order that it may be fully understood \reference is to be had to the accompanyin drawings, in which Figure 1, is a View partly in side elevation and partly in central vertical section, of a grinding tool embodying my invention.

Fig.2, is a horizontal section on the line IIII of Fig. 1.

Fig.- 3, is a fragmentary section on the line TIL-III of Fig. 9.

Fig. 4t is a similar section taken on the line IV-IV of Fig. 2. 1

Fig. 5, is a top plan view with the motor and motor housing member of the casing, removed. l I

Fig. 6, is a diagrammatic side view of the pawl and ratchet mechanism and the tripping and retaining guards therefor.

Referring to the drawings in detail, 1 and 2 are cylindrical housing members screwed together as at The upper member, 2, contains a motor 4 to which wires 5 and 6 are connected for the passage of an electric current to and from the motor to operate the same, the head of the said member being equipped with a push button switch 7 for closing or opening the current to the motor in any suitable manner, and for convenience in handling the tool it is provided at,its upper end with a knob or handle 8. At 9is shown the shaft of the motor and mounted thereon is a gear wheel 10.

p The member 1 of the housing, is provided near its upper end with a head 11 and at its lower end with a tapering head 12 having an elongatci l vertical hub 13 constituting a f substantial bearing for a vertical shaft l l equippedat its lower end with a bit 15 for engagementwith a valve or other ob ect to be oscillated or turned,"the bit being preferably pivoted to the shaft as at 16 to accommodate the tool to. valves and the like which may stand at an angle to the shaft 14.

Secured rigidly on the upper end of shaft 14 within the housing member 1, is a large bevel gear 17 enmeshed with a pair of bevel gears 18 and 19 journaled on a transverse shaft 20 extending across. member 1 and journaled at its ends in bearing boxes 21 extending into said member 1*and secured rigidly thereto in any suitable manner. Cast with or otherwise rigidly secured to bevel gears 18 and 19 are ratchet wheels 22 and 23, the teeth of said ratchet wheels fac-- ing in the same direction.

Rigidly secured upon shaft 20 is a worm wheel 24: enmeshed with a vertical worm 25 secured rigidly on a vertical shaft 26 journaled at its lower end in a lug 27 projecting disks 29 and 30, the former pivotally carrying a dog 31 and a spring 32 engaging the dog and tending to hold the same in engagement with the ratchet wheel 22. The other disk pivotally carries a dog 33 and a spring 34 engaging the dog 33 and tending to hold the same in engagement with ratchet wheel 23.

A yoke-shaped guard 35 is rigidly secured to the head 11 of member 1 of the housing, in

plane of the pawl 31, the opening of the yoke extending concentrically around the ratchet wheel over a range of approximately three-quarters of a circle and of such diameter that when engaged with the rear end of the pawl, it holds the latter out of engagement with the adjacent ratchet wheel 22, leaving said pawl free to turn the ratchet wheel approximately one-quarter revolution in each complete revolution of shaft 20.

A yoke-shaped guard 36 is rigidly secured o the head 11, in the vertical plane of pawl 33, the opening of this yoke extending around ratchet wheel 23 for a distance of approximately one-quarter of a circle and concentrically of said wheel, and so located with respect to the same that when engaged with the rear end of the pawl, it holds the latter out of engagement with the ratchet wheel 23, leaving said pawl free to turn the said ratchet wheel approximately one quarter revolution in each complete revoluthe vertical tion of shaft 20.

The yokes areiso proportioned and the pawls so arranged that'each pawl is tripped from engagement with its respective ratchet wheel, by its respective yoke, just before the other pawl passes out of engagement with its respective yoke and is forced by its spring into engagement with its ratchet wheel, as will be readily seen by reference to Fig. 6. t

Assuming that the bit 15 or its equivalent is engaging the valve to be ground, the operator starts the motor by pressing upon the push button 7. The operation of the motor transmits power through gear wheels 10 and 28, and Worm 25 and worm wheel 24 to shaft 20 in the direction indicated by the arrow, Fig. 6, the pawl-carrying disks both turning in the same direction, the pawl 31 and pawl 33 alternately engaging their respective ratchet wheels and therefore respectively rotating said wheels a quarter of a revolution and three-quarters of a revolution in the same direction. Owing to the fact however, that the wheels 18 and 19 engage Wheel 17 at opposite sides of the center thereof, the latter is alternately turned or oscillated a quarter of a revolution in one direction and three quarters-of a revolution in the reverse direction, which movements are of course transmitted to the valve. It will thus be seen that although the valve is oscillated rapidly it changes its relative position upon the valve seat with each of its longer oscillatory movements, and that the reverse or shorter oscillating movements occur at difi'crent points on the valve seat. By thus constantly changing the position of the valve with relation to its seat both are ground to a smooth and uniformly finished surface. 7

From the above description it will be apparent that we have produceda grinding tool embodying the desirable features enu- Inerated in the statement of the object of the invention, and while the preferred embodiment has been shown and described, it is to be understood that we reserve the right to make such changes in the form, proportion, detailconstruction and arrangement of the parts as properly fall within the spirit and scope of the appended claims.

, We claim: 1. A tool for grinding valves and the like. comprising a shaft, a wheel rigid thereon, a. pair of wheels geared to said first-named wheel for oscillating said shaft, and means for positively rotatlng said pair of wheels unequal distances in the same direction alternately.

2. A tool for grindin' valves and the like, comprising a shaft, a w ieel thereon, a second shaft, means for continuously rotatin said second shaft, :1 pair of Wheels journa ed on said second shaft and engaged with the first-named wheel at opposite sides of the same, and means actuated thro'ugh rotation of said second shaft, to positively rotate the said wheels thereon unequal distances in the same direction alternately.

3. A tool for grinding valves and the like, comprising a shaft, a wheel thereon, a sec ond shaft, means for continuously rotating said second shaft, a, pair of wheels journaled on said second shaft and engaged with the first-named wheel at opposite sides of the same, ratchet wheels rotatable with said pair of wheels, spr'ingactuated pawls -rotatable with said second shaft to engage the ratchet wheels and means for alternately tripping said pawls out of engagement with said wheels.

4:. A tool for grinding valves and the like,

comprising a shaft, a wheel thereon, a sec-- ond shaft, means for continuously rotating said second shaft, a pair of wheels journale on said second shaft and engaged with the first-named wheel at opposite sides of the same, ratchet wheels rotatable with said pair of wheels, spring-actuated pawls rotatable with said second shaftto engage the ratchet wheels and means for alternatelg tripping said pawls out of engagement-wit ing yoke-shaped guar s extending-around the respective pawls of the latter, one of said guards being of greater length than the other and the two together describing less than a full circle.

said wheels; said tripping means compris said ratchet wheels in the path of travel of 5. A tool for grinding valves and the like,

comprising a shaft, end shaft, a'pair of second shaft and engaged with said firstnamed. wheel at opposite sidesof the same, a suitably-driven worm, a worm'wheel secured on said second shaft and meshipg a wheel thereon, a secwheels journaled on said positively rotate saidpair of ternately.

with said worm, and means actuated through rotation of said second shaft, to

Wheels unthe same direction alequal distances in 6. A tool for grinding valves and the like, comprising a cylindrical easing, a shaft journal (1 in said casin and provided with a bit for engaging an o ject to be oscillated, an electric motor mounted in the casing, a transverse shaft journaled in the casing and worm-geared I to and driven by said motor, a pair of wheels journaled on said shaft and ared to the first-named shaft for os the same, and "means actuated by! cillatmg said transverse shaft,

same direction alternately.

In testimony whereof tures, in the presence of two witnesses.

JOHN NZE. GEORGE BAILEY. Witnesses; H I 1 Moon},

V B Bfissny,

to, positively rotate" the wheels thereon unequal distances in the 

